About a month ago I began getting a black screen for a few moments, then the image would return with a message at bottom right saying "Your video driver has momentarily malfuctioned". I was using a Realtek 5450 graphics card. So I bought an nVidia GeForce G710. I'm not a gamer, don't need much but a reliable image. I process photographs. Anyway, the new card also goes out, though only a couple times a week. Still...what can be happening here?

Win 7 Home Pro 64
24 Gigs SDRAM


Thanks

Art Rosch